<template>
    <div class="score-case">
      <div class="table">
        <table>
          <thead>
            <tr>
              <th>编号</th>
              <th>科目</th>
              <th>成绩</th>
              <th>考试时间</th>
              <th>操作</th>
            </tr>
          </thead>
          <tbody v-if="list.length">
            <tr v-for="(item, index) in list" :key="item.id">
              <td>{{ index+1 }}</td>
              <td>{{ item.subject }}</td>
              <td :class="{red:item.score<60}">{{ item.score }}</td>
              <td>{{ formData(item.date) }}</td>
              <td><a href="#" @click.prevent="del(index)">删除</a></td>
            </tr>
          </tbody>
          <tbody v-else>
          <tr>
            <td colspan="5">
              <span class="none">暂无数据</span>
            </td>
          </tr>
        </tbody>
          <tfoot>
            <tr>
              <td colspan="5">
                <span>总分：{{ zhonghe }}</span>
                <span style="margin-left:50px">平均分： {{ pinjun }}</span>
              </td>
            </tr>
          </tfoot>
        </table>
      </div>
      <div class="form">
        <div class="form-item">
          <div class="label">科目：</div>
          <div class="input">
            <input type="text" v-model="subject" placeholder="请输入科目" />
          </div>
        </div>
        <div class="form-item">
          <div class="label">分数：</div>
          <div class="input">
            <input type="text" v-model.number="score" placeholder="请输入分数" />
          </div>
        </div>
        <div class="form-item">
          <div class="label"></div>
          <div class="input">
            <button class="submit" @click="add">添加</button>
          </div>
        </div>
      </div>
    </div>
  </template>
  
  <script>
  import moment from 'moment'
  export default {
    name: 'ScoreCase',
    data () {
      return {
        list: JSON.parse(localStorage.getItem('sub'))||[],
        subject: '',
        score: '',
        num1:''
      }
    },
    watch:{
      list:{
        handler(newValue){
          localStorage.setItem('sub',JSON.stringify(newValue))
        },
        deep:true
      },
    },
    computed:{
      zhonghe(){
        return this.list.reduce((prve,item)=>{
          return item.score + prve
        },0)
      },
      pinjun(){
        console.log(this.zhonghe/this.list.length);
        return this.zhonghe/this.list.length? Number(this.zhonghe/this.list.length).toFixed(2) : 0
      }
    },
    methods:{
        formData(date){
          return moment(date).format('YY-MM-DD HH:mm:ss')
        },
        Login(){
            this.score=this.list[0].score
        },
        del(index){
            this.list.splice(index,1)
        },
        add(){
            if(!this.subject||this.score<0||this.score>100){
                alert('输入不合法')
                return
            }
            this.list.push({
                id:!this.list.length? 0: this.list[this.list.length-1].id+8,
                subject:this.subject,
                score:this.score,
                date:new Date()
            })
            this.score=''
            this.subject=''
        }
    }
  }
  </script>
  
  <style lang="less">
  .score-case {
    width: 1000px;
    margin: 50px auto;
    display: flex;
    .table {
      flex: 4;
      table {
        width: 100%;
        border-spacing: 0;
        border-top: 1px solid #ccc;
        border-left: 1px solid #ccc;
        th {
          background: #f5f5f5;
        }
        tr:hover td {
          background: #f5f5f5;
        }
        td,
        th {
          border-bottom: 1px solid #ccc;
          border-right: 1px solid #ccc;
          text-align: center;
          padding: 10px;
          &.red {
            color: red;
          }
        }
      }
      .none {
        height: 100px;
        line-height: 100px;
        color: #999;
      }
    }
    .form {
      flex: 1;
      padding: 20px;
      .form-item {
        display: flex;
        margin-bottom: 20px;
        align-items: center;
      }
      .form-item .label {
        width: 60px;
        text-align: right;
        font-size: 14px;
      }
      .form-item .input {
        flex: 1;
      }
      .form-item input,
      .form-item select {
        appearance: none;
        outline: none;
        border: 1px solid #ccc;
        width: 200px;
        height: 40px;
        box-sizing: border-box;
        padding: 10px;
        color: #666;
      }
      .form-item input::placeholder {
        color: #666;
      }
      .form-item .cancel,
      .form-item .submit {
        appearance: none;
        outline: none;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 10px;
        margin-right: 10px;
        font-size: 12px;
        background: #ccc;
      }
      .form-item .submit {
        border-color: #069;
        background: #069;
        color: #fff;
      }
    }
  }
  </style>